Remove blockchain.info from feeds for exchange rates.

wallet/README

@@ -192,10 +192,6 @@ I chose this feed because it is not dependent on a single exchange. However, you
 mind it's always a 24h average (falling back to 7d or even 30d if no trade occurred for a long
 time).
 
-If the above feed is not available, the feed from "Blockchain.info" is fetched instead:
-
-	https://blockchain.info/ticker
-
 
 SWEEPING WALLETS
 

wallet/src/de/schildbach/wallet/ExchangeRatesProvider.java

@@ -107,18 +107,12 @@ public String toString()
 	private static final URL BITCOINAVERAGE_URL;
 	private static final String[] BITCOINAVERAGE_FIELDS = new String[] { "24h_avg", "last" };
 	private static final String BITCOINAVERAGE_SOURCE = "BitcoinAverage.com";
-	private static final URL BLOCKCHAININFO_URL;
-	private static final String[] BLOCKCHAININFO_FIELDS = new String[] { "15m" };
-	private static final String BLOCKCHAININFO_SOURCE = "blockchain.info";
-
-	// https://bitmarket.eu/api/ticker
 
 	static
 	{
 		try
 		{
 			BITCOINAVERAGE_URL = new URL("https://api.bitcoinaverage.com/custom/abw");
-			BLOCKCHAININFO_URL = new URL("https://blockchain.info/ticker");
 		}
 		catch (final MalformedURLException x)
 		{
@@ -169,8 +163,6 @@ public Cursor query(final Uri uri, final String[] projection, final String selec
 			Map<String, ExchangeRate> newExchangeRates = null;
 			if (newExchangeRates == null)
 				newExchangeRates = requestExchangeRates(BITCOINAVERAGE_URL, userAgent, BITCOINAVERAGE_SOURCE, BITCOINAVERAGE_FIELDS);
-			if (newExchangeRates == null)
-				newExchangeRates = requestExchangeRates(BLOCKCHAININFO_URL, userAgent, BLOCKCHAININFO_SOURCE, BLOCKCHAININFO_FIELDS);
 
 			if (newExchangeRates != null)
 			{